Texas Instruments Tiris 2000 Series User manual

1
July ’00 Preface
Series 2000 Reader System
4-Channel TX/RX Multiplexer Module
for Remote Antenna RFM RI-MOD-TX8A
Reference Guide
11-06-21-039 July 2000

2
S2000 RA-RFM MUX Module - Reference Guide July ’00
Edition Three - July 2000
This is the third edition of this manual, it describes the following Series 2000 Module:
Series 2000 4-Channel TX/RX Multiplexer for RA-RFM RI-MOD-TX8A
Texas Instruments (TI) reserves the right to make changes to its products or services
or to discontinue any product or service at any time without notice. TI provides cus-
tomer assistance in various technical areas, but does not have full access to data
concerning the use and applications of customer's products.
Therefore, TI assumes no liability and is not responsible for customer applications or
product or software design or performance relating to systems or applications incor-
porating TI products. In addition, TI assumes no liability and is not responsible for
infringement of patents and/or any other intellectual or industrial property rights of
third parties, which may result from assistance provided by TI.
TI products are not designed, intended, authorized or warranted to be suitable for life
support applications or any other life critical applications which could involve poten-
tial risk of death, personal injury or severe property or environmental damage.
The TIRIS logo and the word TIRIS are registered trademarks of Texas Instruments
Incorporated.
Copyright 2000 Texas Instruments Incorporated (TI)
This document may be downloaded onto a computer, stored and duplicated as nec-
essary to support the use of the related TI products. Any other type of duplication,
circulation or storage on data carriers in any manner not authorized by TI represents
a violation of the applicable copyright laws and shall be prosecuted.

PREFACE
3
Read This First
About This Guide This manual describes the TIRIS 4-Channel Transmit/Receive Multiplexer (TX/RX
MUX) Module RI-MOD-TX8A. It describes the module itself, how to install it and how
to use it.
Conventions
If You Need Assistance
Application Centers are located in Europe, North and South America, the Far East
and Australia to provide direct support. For more information, please contact your
nearest TIRIS Sales and Application Center. The contact addresses can be found on
our home page:
http://www.tiris.com
WARNING:
A WARNING IS USED WHERE CARE MUST BE TAKEN, OR A
CERTAIN PROCEDURE MUST BE FOLLOWED IN ORDER TO PRE-
VENT INJURY OR HARM TO YOUR HEALTH.
CAUTION:
This indicates information on conditions which must be
met, or a procedure which must be followed, which if not
heeded could cause permanent damage to the equipment
or software.
Note:
Indicates conditions which must be met, or procedures which must be
followed, to ensure proper functioning of the equipment or software.
Information:
Indicates information which makes usage of the equipment or soft-
ware easier

4
S2000 RA-RFM MUX Module - Reference Guide July ’00
Document Overview Page
Chapter 1: Product Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Introduction......................................................................................... 6
1.2 Product Description............................................................................ 6
Chapter 2: Connectors and Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1 Connectors....................................................................................... 10
2.2 Jumpers............................................................................................ 12
Chapter 3: Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1 Recommended Operating Conditions.............................................. 14
3.2 Electrical Characteristics.................................................................. 14
3.3 Timing Characteristics...................................................................... 14
3.4 Mechanical data............................................................................... 15
Chapter 4: Installation and Use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.1 Connecting Multiplexer to Remote Antenna RFM............................ 17
4.2 Power Supply ................................................................................... 18
4.3 Antenna Requirements..................................................................... 18
4.4 Connecting Cable............................................................................. 19
4.5 Antenna Resonance Tuning............................................................. 19
List of Figures Page
Figure 1: Top View......................................................................................... 7
Figure 2: Block Diagram................................................................................. 8
Figure 3: Configuration for Input Signals CSA and CSB................................ 8
Figure 4: Jumper Locations.......................................................................... 12
Figure 5: Module Layout and Dimensions.................................................... 15
Figure 6: Connection of Multiplexer to RA-RFM .......................................... 17
List of Tables Page
Table 1: 1 Pin Functions .............................................................................. 10
Table 2: J4 Pin Functions............................................................................. 10
Table 3: J3 Pin Functions............................................................................. 10
Table 4: J6 Pin Functions............................................................................. 11
Table 5: TX/RX Channel Selection .............................................................. 11
Table 6: Size and Weight............................................................................. 15
Table 7: Antenna Characteristics................................................................. 19

CHAPTER 1
5
Product Description
Chapter 1: Product Description
This chapter will introduce you to the Multiplexer Module and the products with which
it works. It also provides an overview of the function of the RA-RFM multiplexer.
Topic Page
1.1 Introduction................................................................................................6
1.1.1 General ..................................................................................................6
1.2 Product Description...................................................................................6
1.1.2 Reference...............................................................................................6
1.2.1 Description.............................................................................................6

6
S2000 RA-RFM MUX Module - Reference Guide July ’00
1.1 Introduction
1.1.1 General
This document provides information about the TIRIS 4-Channel Transmit/Receive
Multiplexer (TX/RX MUX) Module RI-MOD-TX8A. It describes the module and how
to install it.
The multiplexer module allows the use of up to 4 transmit/receive (TX/RX) antennas
with one Remote Antenna Radio Frequency Module (RA-RFM) System.
1.1.2 Reference
This document should be used in conjunction with the High Performance Remote An-
tenna RFM (RI-RFM-008B) Reference Manual (Manual Number: 11-06-21-047).
1.2 Product Description
1.2.1 Description
The multiplexer is connected between an RA-RFM and the Tuning Board (TB). The
active antenna (TX/RX channel) is selected by two digital input signals. All antennas
can be disabled by removing one jumper.
The supply voltages and channel selection signals are connected via a 4-pin connec-
tor.
Connection to the RA-RFM and to the antennas is made via two screw block termi-
nals.
The channel select input signals, connected to a data processing unit (for example:
TIRIS Series 2000 Control Module, or a customer designed Control Unit), are Low
Power Schottky TTL and HCMOS Logic compatible.
The Multiplexer includes circuitry to reduce crosstalk of transmit function.
There are four connectors on the multiplexer, they are:
J1 which is used to connect the supply voltage and channel select signals
J3 which is used to connect up to 4 antennas
J4 the antenna resonator connector, which is used to connect the multi-
plexer board to the Antenna terminals of the RA-RFM
J6 which can be used to connect the multiplexer ground to earth
The multiplexer can be mounted by means of four M3 mounting bolts on the under-
side of the module.
A layout of the multiplexer viewed from the top is shown in Figure 1. A block sche-
matic of the multiplexer is shown in Figure 2. The multiplexer is described in the fol-
lowing section.

7
July ’00 Chapter 1. Product Description
The multiplexer switches the selected Antenna to the RA-RFM. The multiplexer
switches both the transmit and receive functions of the Antenna. Low resistance high
voltage switches (MOSFETs) are used to switch the antenna connection because of
the high voltage used during transmitting.
Figure 1: Top View
C6-3 C6-2 C6-1
R4-4
R4-3
C7-4 C7-3 C7-2 C7-1
ZD4 ZD3 ZD2 ZD1
IC4
R4-2
R4-1
R8-4
R7-4
R6-4
R8-3
R7-3
R6-3
R8-2
R6-2
R7-2
R8-1
1
RN1
D5
S
G
D
Q25-4
S
G
D
Q25-3
S
G
D
Q25-2
S
G
D
Q25-1
Q24
Q21
Q18
Q15
Q12
Q9
Q6
Q3
Q23
Q20
Q17
Q14
Q11
Q8
Q5
Q2
Q22
Q19
Q16
Q13
Q10
Q7
Q4
Q1
R3-4
R3-3
R3-2 R3-1
IC5-4IC5-3
IC5-2IC5-1
R7-1
L3
L5
J1
1
IC2
IC1
R4
R3
R2 R1
R6-1
C10
1J2
1J5
J6
1
C9
2
1
J4
C8
U2
C12
C11
IC3
C5
C4
C1
8
1
J3
C3
C2
C6-4 L4 L2
U1
1J7
L1
1
C
B
E
Q29
V_IN GND
CSA
CSB
C
onnec
t
or
f
or
P
ower
S
u
p
p
l
y
an
d
for channel select signals
Connection to
RA RF Module
antenna terminals
TX/RX
TB1
TX/RX
TB2
TX/RX
TB3
TX/RX
TB4

8
S2000 RA-RFM MUX Module - Reference Guide July ’00
Figure 2: Block Diagram
All multiplexed antennas have one common terminal, which is the antenna terminal
ANT. The other antenna terminals are connected to ground GNDTX via a switch.
The active TX/RX channel is selected by the two binary weighted channel select sig-
nals CSA and CSB, table 5 shows the binary configuration needed to select each
channel. The configuration of the input signals CSA and CSB is shown in Figure 3.
Figure 3: Configuration for Input Signals CSA and CSB
WARNING:
CARE MUST BE TAKEN WHEN HANDLING THE RA-RFM. HIGH
VOLTAGE ACROSS THE ANTENNA TERMINALS AND ALL
ANTENNA RESONATOR PARTS COULD BE HARMFUL TO YOUR
HEALTH. IFTHE ANTENNA INSULATION IS DAMAGED IT
SHOULD NOT BE CONNECTED TO THE RA-RFM.
Channel
Selection
GNDTX
Connection to
RF Module
antenna
terminals
ENTX-
ANT
GNDTX
CSA
CSB
TX/RX
TB1 TX/RX
TB2 TX/RX TB3 TX/RX TB4

CHAPTER 2
9
Connectors and Jumpers
Chapter 2: Connectors and Jumpers
This chapter describes the connectors and jumpers on the multiplexer.
Topic Page
2.1 Connectors...............................................................................................10
2.2 Jumpers....................................................................................................12
2.2.1 Jumper J2 ..................................................................................12
2.2.2 Jumper J5 ..................................................................................12
2.2.3 Jumper J7 ..................................................................................12

10
S2000 RA-RFM MUX Module - Reference Guide July ’00
2.1 Connectors
Table 1 lists the pin functions for connector J1. The connector type is a 4-pin plug-in
screw connector with 5.08 mm pin spacing.
Table 2 lists the pin functions for the antenna screw block terminal J4. The multiplex-
er is connected to the RA-RFM antenna terminals via connector J4.
Table 3 lists the pin functions for the antenna screw block terminal J3. The TX/RX
antennas must be connected to the RA-RFM antenna terminals via the tuning boards
to connector J3.
Table 4 lists the pin function for ground post J6.
Table 5 shows the logic switching of the active channel.
All connectors are accessible from the top.
Table 1: 1 Pin Functions
Pin# Signal Direction Description
1 V_IN IN Supply voltage input
2 GND IN Ground
3 CSA IN Channel Select signal CSA (LSB)
4 CSB IN Channel Select signal CSB (MSB)
Table 2: J4 Pin Functions
Pin# Signal Direction Description
1 ANT IN/OUT Antenna resonator signal. This pin must be
connected to signal ANT_1 on the RA-RFM.
2 GNDTX IN/OUT Antenna ground. This pin must be connected to
ANT_2 on the RA-RFM.
Table 3: J3 Pin Functions
Pin# Signal Direction Description
1 A_OUT4 IN/OUT Switched antenna signal (switched to ground
GNDTX, when active). Connected to Tuning Board.
2 ANT IN/OUT Antenna resonator signal. Connected to Tuning
Board.
3 A_OUT3 IN/OUT Switched antenna signal (switched to ground
GNDTX, when active). Connected to Tuning Board.
4 ANT IN/OUT Antenna resonator signal. Connected to Tuning
Board.

11
July ’00 Chapter 2. Connectors and Jumpers
5 A_OUT2 IN/OUT Switched antenna signal (switched to ground
GNDTX, when active). Connected to Tuning Board.
6 ANT IN/OUT Antenna resonator signal. Connected to Tuning
Board.
7 A_OUT1 IN/OUT Switched antenna signal (switched to ground
GNDTX, when active). Connected to Tuning Board.
8 ANT IN/OUT Antenna resonator signal. Connected to Tuning
Board.
Table 4: J6 Pin Functions
Pin# Signal Direction Description
1 GND IN/OUT Multiplexer Ground.
Table 5: TX/RX Channel Selection
Signal
CSA Signal CSB
Active TX/
RX
antenna at antennaat Connector
LOW LOW Channel 1 J3, pins 7 and 8
HIGH LOW Channel 2 J3, pins 5 and 6
LOW HIGH Channel 3 J3, pins 3 and 4
HIGH HIGH Channel 4 J3, pins 1 and 2
Table 3: J3 Pin Functions
Pin# Signal Direction Description

12
S2000 RA-RFM MUX Module - Reference Guide July ’00
2.2 Jumpers
There are 3 jumpers on the Multiplexer, for location of the jumpers please refer to
Figure 4. The jumpers are described in detail following:
Figure 4: Jumper Locations
2.2.1 Jumper J2
This jumper is used to enable all TX/RX channels. When this jumper is open, all TX/
RX channels are disabled. When it is closed, all TX/RX channels are enabled.
Default: closed
2.2.2 Jumper J5
This jumper is used to connect the antenna terminal GNDTX (pin 2 of connector J4)
to the Multiplexer ground GND.
Default: open
2.2.3 Jumper J7
This jumper is used to connect the Multiplexer mounting bolt to ground GND. The
Multiplexer can be earthed via the mounting bolt if required.
Default: open
J2
J5
J7

CHAPTER 3
13
Specifications
Chapter 3: Specifications
This chapter provides the specific details that you will need in order to use the TIRIS
4-Channel Transmit/Receive Multiplexer (TX/RX MUX) Module RI-MOD-TX8A cor-
rectly. It includes general data, electrical characteristics, timing characteristics and
mechanical data.
Topic Page
3.1 Recommended Operating Conditions....................................................14
3.2 Electrical Characteristics........................................................................14
3.3 Timing Characteristics ............................................................................14
3.4 Mechanical data .......................................................................................15

14
S2000 RA-RFM MUX Module - Reference Guide July ’00
3.1 Recommended Operating Conditions
These specifications are based on a free-air temperature of 25 ºC.
.
3.2 Electrical Characteristics
3.3 Timing Characteristics
Note:
Free-air temperature: air temperature immediately surrounding the
Multiplexer module. If the module is incorporated into a housing, it
must be guaranteed by proper design or cooling that the internal tem-
perature does not exceed the absolute maximum ratings.
Symbol Parameter min. typ. max. Unit
V_V_IN Supply voltage Multiplexer Module 10.0 12.0 24.0 V DC
I_V_IN Supply current for Multiplexer Module 60 120 mA
V_ANT Antenna Resonance Voltage 350 Vpeak
T_oper Operating Temperature -25 25 +70 ºC
T_store Storage Temperature -40 - +85 ºC
Symbol Parameter min. typ. max. Unit
R_Cha Additional antenna resonator resistance per channel 4.0 Ohm
V_U1 Internal stabilized logic supply voltage 4.5 5.0 5.5 V
V_U2 Internal stabilized driver supply voltage 10.8 12.0 13.2 V
ViL Low level input voltage of signals CSA, CSB and
Enable signal 00.8V
ViH High level input voltage of signals CSA, CSB and
Enable signal (J2) 2.4 5.0 V
Fan-In Low Power Schottky compatible fan-in of signals CSA, CSB and Enable signal
(Iin = -400 µA) 1-
Symbol Parameter min. typ. max. Unit
f_TX Transmit frequency 134.18 134.20 134.22 kHz
t_ri
t_fi Rise and fall time of input signals CSA, CSB and Enable signal 1 1µs
µs
t_short Maximum short circuit time of antenna terminals 10 s

15
July ’00 Chapter 3. Specifications
3.4 Mechanical data
The mechanical size and weight is given in Table 6. Further mechanical details are
provided in Figure 5. All of the measurements given in Figure 5 have a tolerance of
± 0.25 mm.
Figure 5: Module Layout and Dimensions
CAUTION:
Shorting the antenna terminals during operation may
cause permanent damage to the RA-RFM.
Table 6: Size and Weight
Parameter typical Unit
Height (including mounting bolts) 31.0 ± 2.0 mm
Weight of complete Multiplexer 120 Grams
C6-3 C6-2 C6-1
R4-4
R4-3
C7-4 C7-3 C7-2 C7-1
ZD4 ZD3 ZD2 ZD1
IC4
R4-2
R4-1
R8-4
R7-4
R6-4
R8-3
R7-3
R6-3
R8-2
R6-2
R7-2
R8-1
1
RN1
D5
S
G
D
Q25-4
S
G
D
Q25-3
S
G
D
Q25-2
S
G
D
Q25-1
Q21 Q15 Q9
Q6
Q3
Q20 Q14 Q8
Q5
Q2
Q22
Q19
Q16
Q13
Q10
Q7
Q4
Q1
R3-4 R3-3 R3-2 R3-1
IC5-4 IC5-3
IC5-2 IC5-1
R7-1
L3
L5
PHOENIX
MSTBVA 2.5/4-G5.08
J1
1
IC2
IC1
R4
R3
R2 R1
R6-1
C10
1
J2
1
J5
J6
1
C9
2
1
J4
C8
U2
C12
C11
IC3
C5
C4
C1
8
1
J3
C3
C2
C6-4 L4 L2
U1
1
J7
L1
1
C
BE
Q29
73.8
95.3
64.3
90.2
85.1
5.1
5.1
135.9
130.8
84.0
17.3
23

CHAPTER 4
16
Installation & Use
Chapter 4: Installation and Use
This chapter provides the specific details that you will need in order to install the TI-
RIS 4-Channel Transmit/Receive Multiplexer correctly. It includes a detailed descrip-
tion of the power supply requirements, the antenna characteristics, the connecting
cable and how to tune the antenna to resonance.
Topic Page
4.1 Connecting Multiplexer to Remote Antenna RFM.................................17
4.2 Power Supply ...........................................................................................18
4.3 Antenna Requirements............................................................................18
4.4 Connecting Cable.....................................................................................19
4.5 Antenna Resonance Tuning....................................................................19

17
July ’00 Chapter 4. Installation & Use
4.1 Connecting Multiplexer to Remote Antenna RFM
Figure 6 shows how the multiplexer should be connected to the RA-RFM and how
the TX/RX antennas should be connected. If you wish to connect the antenna con-
necting cable shields to ground at the reader end, the cable shields can be connect-
ed together and then connected to pin 1 of the RA-RFM antenna connector. In order
to connect pin 1 of the antenna connector to ground (GNDA), jumper J10 on the RA-
RFM must be closed.
Figure 6: Connection of Multiplexer to RA-RFM
The antennas must (as usual) be tuned to resonance together with RA-RFM system
and the Tuning Board. As the Multiplexer does not include the feature to tune the an-
tennas individually to resonance, the tuning has to be done in such a way that the
optimum reading performance is achieved for each antenna.
Note:
The lines ANT and GNDTX, which connect the Multiplexer board to
the RA-RFM must be connected as shown. They must not be
swapped, otherwise the Multiplexer will not work.
1
TB
TB
ANT_1
ANT_2
e.g.16uH
e.g.27uH
RA-RFM
CTL
CS_A
CS_B
-
+
TWIN-AX
C6-3 C6-2 C6-1
R4-4
R4-3
C7-4 C7-3 C7-2 C7-1
ZD4 ZD3 ZD2 ZD1
IC4
R4-2
R4-1
R8-4
R7-4
R6-4
R8-3
R7-3
R6-3
R8-2
R6-2
R7-2
R8-1
1
RN1
D5
Q25-4
Q25-3
Q25-2
Q25-1
Q24
Q21
Q18
Q15
Q12
Q9
Q6
Q3
Q23
Q20
Q17
Q14
Q11
Q8
Q5
Q2
Q22
Q19
Q16
Q13
Q10
Q7
Q4
Q1
R3-4 R3-3 R3-2 R3-1
IC5-4IC5-3
IC5-2IC5-1
R7-1
L3
L5
J1
1
IC2
IC1
R4
R3
R2 R1
R6-1
C10
1J2
1J5
J6
1
C9
2
1
J4
C8
U2
C12
C11
IC3
C5
C4
C1
8
1
J3
C3
C2
C6-4 L4 L2
U1
1J7
L1
1
Q29
SHIELD
GNDA
J10

18
S2000 RA-RFM MUX Module - Reference Guide July ’00
4.2 Power Supply
The multiplexer has built-in voltage regulators to supply the logic part and the MOS
FET drivers with a regulated voltage. The input supply voltage must be connected to
the pins V_IN and GND of connector J1. The input voltage needs to be stabilized
(dc), but not regulated and can be between 10 and 24 V.
Noise from power supplies or noise on the interface lines can interfere with the RA-
RFM's receiver. Therefore, if the application requires it, it may be necessary to place
additional filters in series to the supply and interface lines. For more details refer to
RA-RFM Reference Manual (see section 1.1.2).
4.3 Antenna Requirements
The transmit antenna for the RF Module (which is used to charge up the transponder)
is a coil, this coil is part of the antenna resonant circuit of the RF Module.
In order to achieve the high voltages at the antenna resonant circuit and thus high
field strength at the antenna for charge-up (transmit) function, the antenna coil must
have a high quality factor. The recommended quality factor for proper operation is
listed in Table 7.
Note:
Enabling a TX/RX channel enables both the transmit and receive
function. However disabling a TX/RX channel only disables the Trans-
mit function (charge-up of a transponder). The transmit function of a
disabled channel is never completely switched off, as there is still
some coupling of the antenna resonance voltage from the active
channel to the disabled channels via the parasitic capacitance of the
MOSFET switch. This means that a transponder could still be
charged-up at a distance of a few centimetres from a disabled TX/RX
antenna.
The receive function at a switched off antenna is never completely
switched off, because there is still reasonable coupling via the para-
sitic capacitance of the MOSFET switch. As the TIRIS receiver is very
sensitive, the small voltage which is coupled via this capacitance, can
still be enough to receive a transponder signal.
Note:
The multiplexer must not be supplied by Switched Mode Power Sup-
plies (SMPS). This is because most SMPS operate at frequencies
around 50 kHz. The harmonics of the generated field can interfere
with the TIRIS receiver. Therefore only use linear power supplies, or
SMPS with a fundamental operating frequency of 200 kHz or higher.

19
July ’00 Chapter 4. Installation & Use
4.4 Connecting Cable
We recommend that the cable between the RA-RFM and the Multiplexer is low resis-
tive (for example: RF Litz wire 120 x 0.1 mm, or loudspeaker cable with at least the
same cross-sectional area) with a maximum length of 30 cm. If the connecting cable
is longer than 20 cm it will affect the quality factor and inductance.
For the connection between the Multiplexer and the Antenna Tuning Board we rec-
ommend a symmetrically shielded Cable (Twin-Ax) with a maximum length of
100meter (Characteristic Impedance 100 to 105 Ohm, Capacitance 50.9 pF/meter,
Diameter 8.4 mm).
4.5 Antenna Resonance Tuning
For proper operation of the transmitter and receive function, the antenna has to be
tuned to the resonance frequency f_TX. For a detailed description of the antenna res-
onance tuning procedure, see the RA-RFM Reference Manual (see section 1.1.2)
Table 7: Antenna Characteristics
Parameter Conditions Min. typ. max. Unit
L_ANT Antenna inductance range, within which the antenna can be tuned to resonance
using the tuning coil on the RF Module 82780
µH
Q_ANT Recommended quality factor of antenna
coil for proper operation 100

20
S2000 RA-RFM MUX Module - Reference Guide July ’00